Background: Phenol compounds and flavonoids are known to have antioxidant activity. Sterculia genus has secondary metabolite rich of phenols and flavonoids. Objective: The aim of this study of the activity antioxidants of Sterculia stipulata Korth Woods and leaves by FRAP method.Materials and Methods: Extraction is done using n-hexane, ethyl acetate, and methanol. The methanol extract was determined antioxidant test using the FRAP method and also determined the total phenol content, total flavonoids, and its compounds. Results: The antioxidant activity of wood extract was 4.74 ± 1.03 FeEAC (mol / g) while leaf extract 41.17 ± 1.99 FeEAC (mol / g). Total phenol content for wood extract 16.46 ± 3.51 mg GAE/g, for leaf extract 141.62 ± 10.54. The total flavonoid content for wood extract was 27.99 ± 0.62 mg QE / gr for leaf extract 41.45 ± 5.83 mg QE / gr. The compounds of wood and leaves are the same; it is consist of terpenoids, alkaloids, phenols, flavonoids, saponins, terpenoids, and negatives for anthraquinone. Conclusion: The antioxidant activity of the leaves of Sterculia stipulata is greater than its wood activities.

Key words: Antioxidant, Sterculia stipulata, FRAP, Phenols, Flavonoids